Global Patent Index - EP 0973972 A1

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Title (fr)

Publication

Application

Priority

FI 9800270 W 19980326

FI 971343 A 19970402

Abstract (en)

[origin: WO9844196A1] The invention concerns a calendering method, in which the paper or board web (W) is passed through the calender, in which calender the calendering nip (N) is formed between a heatable hard roll (11) and an endless, flexible and substantially non-compressible calendering belt (15) passed over said roll. The heatable hard roll (11) is heated in order to plasticize the surface layer of the web (W) to be calendered placed at the side of the heatable roll, and the web (W) is brought into a preliminary contact with the heatable roll (11) before the calendering proper of the web (W). After the stage of preliminary contact (I), the press treatment proper is applied to the web (W) to be calendered in two stages. First a deformation is produced in the material web (W) in the press stage (II), after that the deformation that was produced in the press stage (II) is allowed to be reversed partially under control in a reversing stage (III), and a new deformation is produced in the material web (W), which was already once pressed and partly reversed, by pressing the web again in a finishing press stage (IV). After the finishing press stage (IV), the calendered web is supported by means of the calendering belt (15) over a certain distance before the web (W) is passed away from between the heatable hard roll (11) and the calendering belt (15).